From ea0364f1bbfed1e3ea711147420875cf338fe77a Mon Sep 17 00:00:00 2001
From: Peter Tyser <ptyser@xes-inc.com>
Date: Mon, 12 Apr 2010 22:28:04 -0500
Subject: Move lib_$ARCH directories to arch/$ARCH/lib

Also move lib_$ARCH/config.mk to arch/$ARCH/config.mk

This change is intended to clean up the top-level directory structure
and more closely mimic Linux's directory organization.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
---
 arch/blackfin/lib/ins.S | 117 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 arch/blackfin/lib/ins.S

(limited to 'arch/blackfin/lib/ins.S')

diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S
new file mode 100644
index 000000000..451959642
--- /dev/null
+++ b/arch/blackfin/lib/ins.S
@@ -0,0 +1,117 @@
+/*
+ * arch/blackfin/lib/ins.S - ins{bwl} using hardware loops
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <asm/blackfin.h>
+
+.align 2
+
+#ifdef CONFIG_IPIPE
+# define DO_CLI \
+	[--sp] = rets; \
+	[--sp] = (P5:0); \
+	sp += -12; \
+	call ___ipipe_disable_root_irqs_hw; \
+	sp += 12; \
+	(P5:0) = [sp++];
+# define CLI_INNER_NOP
+#else
+# define DO_CLI cli R3;
+# define CLI_INNER_NOP nop; nop; nop;
+#endif
+
+#ifdef CONFIG_IPIPE
+# define DO_STI \
+	sp += -12; \
+	call ___ipipe_enable_root_irqs_hw; \
+	sp += 12; \
+2:	rets = [sp++];
+#else
+# define DO_STI 2: sti R3;
+#endif
+
+#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
+# define CLI_OUTER DO_CLI;
+# define STI_OUTER DO_STI;
+# define CLI_INNER 1:
+# if ANOMALY_05000416
+#  define STI_INNER nop; 2: nop;
+# else
+#  define STI_INNER 2:
+# endif
+#else
+# define CLI_OUTER
+# define STI_OUTER
+# define CLI_INNER 1: DO_CLI; CLI_INNER_NOP;
+# define STI_INNER DO_STI;
+#endif
+
+/*
+ * Reads on the Blackfin are speculative. In Blackfin terms, this means they
+ * can be interrupted at any time (even after they have been issued on to the
+ * external bus), and re-issued after the interrupt occurs.
+ *
+ * If a FIFO is sitting on the end of the read, it will see two reads,
+ * when the core only sees one. The FIFO receives the read which is cancelled,
+ * and not delivered to the core.
+ *
+ * To solve this, interrupts are turned off before reads occur to I/O space.
+ * There are 3 versions of all these functions
+ *  - turns interrupts off every read (higher overhead, but lower latency)
+ *  - turns interrupts off every loop (low overhead, but longer latency)
+ *  - DMA version, which do not suffer from this issue. DMA versions have
+ *      different name (prefixed by dma_ ), and are located in
+ *      ../kernel/bfin_dma_5xx.c
+ * Using the dma related functions are recommended for transfering large
+ * buffers in/out of FIFOs.
+ */
+
+#define COMMON_INS(func, ops) \
+ENTRY(_ins##func) \
+	P0 = R0;	/* P0 = port */ \
+	CLI_OUTER;	/* 3 instructions before first read access */ \
+	P1 = R1;	/* P1 = address */ \
+	P2 = R2;	/* P2 = count */ \
+	SSYNC; \
+ \
+	LSETUP(1f, 2f) LC0 = P2; \
+	CLI_INNER; \
+	ops; \
+	STI_INNER; \
+ \
+	STI_OUTER; \
+	RTS; \
+ENDPROC(_ins##func)
+
+COMMON_INS(l, \
+	R0 = [P0]; \
+	[P1++] = R0; \
+)
+
+COMMON_INS(w, \
+	R0 = W[P0]; \
+	W[P1++] = R0; \
+)
+
+COMMON_INS(w_8, \
+	R0 = W[P0]; \
+	B[P1++] = R0; \
+	R0 = R0 >> 8; \
+	B[P1++] = R0; \
+)
+
+COMMON_INS(b, \
+	R0 = B[P0]; \
+	B[P1++] = R0; \
+)
+
+COMMON_INS(l_16, \
+	R0 = [P0]; \
+	W[P1++] = R0; \
+	R0 = R0 >> 16; \
+	W[P1++] = R0; \
+)
-- 
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